fix runtime error: dotnet/standard#530

Author: cuiliang

src/OssClient.cs

@@ -243,18 +243,12 @@ public string GetFileDownloadLink(BucketInfo bucket, string storeKey, int expire
         {
             long seconds = (DateTime.UtcNow.Ticks - 621355968000000000) / 10000000;
 
-            string toSign = String.Format("GET\n\n\n{0}\n/{1}/{2}", seconds, bucket, storeKey);
+            string toSign = String.Format("GET\n\n\n{0}\n/{1}/{2}", seconds, bucket.BucketName, storeKey);
 
             string sign = ServiceSignature.Create().ComputeSignature(
                 _requestContext.OssCredential.AccessKeyId, toSign);
 
-            string url = String.Format("{0}{1}/{2}?OSSAccessKeyId={3}&Expires={4}&Signature={5}",
-                bucket.EndpointUri,
-                bucket,
-                storeKey,
-                _requestContext.OssCredential.AccessKeyId,
-                seconds,
-                WebUtility.UrlEncode(sign));
+            string url = $"{bucket.BucketUri}/{storeKey}?OSSAccessKeyId={_requestContext.OssCredential.AccessKeyId}&Expires={seconds}&Signature={WebUtility.UrlEncode(sign)}";
 
             return url;
         }

src/Utility/Authentication/HmacSHA1Signature.cs

@@ -24,10 +24,17 @@ protected override string ComputeSignatureCore(string key, string data)
         {
             Debug.Assert(!string.IsNullOrEmpty(data));
 
-            using (var algorithm = KeyedHashAlgorithm.Create(
-                SignatureMethod.ToString().ToUpperInvariant()))
+            //using (var algorithm = KeyedHashAlgorithm.Create(
+            //    SignatureMethod.ToString().ToUpperInvariant()))
+            //{
+            //    algorithm.Key = _encoding.GetBytes(key.ToCharArray());
+            //    return Convert.ToBase64String(
+            //        algorithm.ComputeHash(_encoding.GetBytes(data.ToCharArray())));
+            //}
+
+            using (var algorithm = new HMACSHA1(_encoding.GetBytes(key.ToCharArray())))
             {
-                algorithm.Key = _encoding.GetBytes(key.ToCharArray());
+                //algorithm.Key = _encoding.GetBytes(key.ToCharArray());
                 return Convert.ToBase64String(
                     algorithm.ComputeHash(_encoding.GetBytes(data.ToCharArray())));
             }